CN209055782U - A kind of system of auto-focusing - Google Patents
A kind of system of auto-focusing Download PDFInfo
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- CN209055782U CN209055782U CN201821818005.5U CN201821818005U CN209055782U CN 209055782 U CN209055782 U CN 209055782U CN 201821818005 U CN201821818005 U CN 201821818005U CN 209055782 U CN209055782 U CN 209055782U
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- mirror
- light
- reflecting
- focusing
- light path
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Abstract
The utility model discloses a kind of systems of auto-focusing, including low-coherence light source, fiber coupler, reference arm light path system, sample arm light path system, computer processing terminal and photodetector, the reference arm light path system includes the first collimating mirror and reflecting mirror, first collimating mirror is connected with reflecting mirror by light, the sample arm light path system includes camera, second collimating mirror, half-reflecting half mirror and flat field focus lamp, second collimating mirror is connect by the reflecting surface of half-reflecting half mirror with f-theta mirror light, the camera is used to receive the transmitted light of the half-reflecting half mirror；The utility model devises a kind of method and system of fast and accurate auto-focusing based on Michelson's interferometer principle, its spatial resolution of focusing can reach micron order, use the reference arm light path system of linear motion, it is able to achieve quick and continuous linear array light path scanning, it is affected by the external environment simultaneously minimum, can under various light and shade light environments normal use, practicability it is stronger.
Description
Technical field
The utility model relates to camera focusing technical fields, more specifically to a kind of system of auto-focusing.
Background technique
There are mainly three types of existing automatic focusing method of camera: the first is phase focusing, passes through object in detection scene
Light amount information, compare defocus and focusing in the case of sensor output waveform position, to realize auto-focusing.Related patents
There are CN103852955A, CN105549301A.This method is more demanding to the light of environment, the focus effects under low light environment
It can have a greatly reduced quality.Second is contrast focusing, and contrast focusing is the method based on image procossing.By lens set in one-dimensional square
On movement, element sensor can detect entire scene longitudinal direction comprehensively.Pass through the contrast to each image
It is compared, finds out the maximum position of contrast, the position of focus can be found out.The working method of contrast focusing needs camera eyeglass
Group is moved forward and backward once and records all image informations and could complete once to focus, so the time expended is long, it cannot be quickly right
It is burnt.The third is laser focusing, and related patents have CN106054495A, and this method focusing speed is slow, complex steps of focusing, together
Sample cannot achieve fast automatic focusing.
Patent CN106054495A proposes a kind of focusing method, device, by judging whether focus target is located at laser
Whether current detection module needs to rotate determining laser and mobile.Although this method can be carried out auto-focusing, it is focused
Process is cumbersome, and control system is complicated, cannot achieve rapid focus.
Patent CN103852955A proposes a kind of device for realizing phase focusing.The device includes lens group, image biography
Sensor, image processing unit and radical occlusion device.When light propagated forward, the light device that is blocked in part is blocked, and a part is passed by image
Sensor is received, and the relative position of image and focus image is obtained after processing unit processes, so that it is determined that the movement of lens group
Direction, control focusing mechanism complete auto-focusing.The device is able to achieve auto-focusing, but it is larger by such environmental effects, and one
When denier external environment light deficiency, the signal that imaging sensor receives is weaker, and focus effects will be affected.
Patent CN105549301A discloses a kind of control method for imaging device focusing.This method is according to phase
The pixel output left and right waveform phase difference corresponding time is detected, control focusing motor driven focus lens run the corresponding time,
Abovementioned steps are repeated until camera focusing is completed.This method has certain feasibility, but focusing time is too long, equally can not be quick
Complete focusing work.
The all indeterminable major issue of above method is: camera focusing required time is long, has specific want to environmental factor
It asks, precision of focusing, focusing speed are not able to satisfy the higher and higher shooting demand of various occasions.Therefore, the prior art exists obvious
Deficiency tightly needs to improve.
Utility model content
Aiming at the problems existing in the prior art, the utility model provides what one kind was not influenced by shooting environmental light, fastly
Fast accurately autofocus system.
The solution that the utility model solves its technical problem is:
A kind of system of auto-focusing, including low-coherence light source, fiber coupler, reference arm light path system, sample ami light
Road system, computer processing terminal and photodetector, the reference arm light path system includes the first collimating mirror and reflecting mirror, described
First collimating mirror is connected with reflecting mirror by light, and the sample arm light path system includes camera, the second collimating mirror, half-reflection and half-transmission
Mirror and flat field focus lamp, second collimating mirror is connect by the reflecting surface of half-reflecting half mirror with f-theta mirror light, described
Half-reflecting half mirror is reflexed in f-theta mirror, the phase with the emergent light of 45 ° of the second collimating mirror of incident corner reflection
Machine is used to receive the transmitted light of the half-reflecting half mirror, the fiber coupler respectively with low-coherence light source, the first collimating mirror, the
Two collimating mirrors, photodetector are connected by optical fiber, and the photodetector is connected with computer processing terminal；
The light beam that low-coherence light source issues enters fiber coupler, and light beam is divided into the first light beam according to the splitting ratio of 10:90
With the second light beam, first light beam enters the first collimating mirror, and second light beam enters the second collimating mirror；
The photodetector generates the interference signal peak in fiber coupler for capturing, and is converted into electric signal
Pass to computer processing terminal；
The computer processing terminal is handled the electric signal according to Michelson's interferometer principle of interference, according to place
Reason result adjusts the focal length of the camera.
Further, capture card is equipped between the photodetector and computer processing terminal, the capture card is used for light
The electric signal of electric explorer output is converted into digital signal, and gives the digital data transmission to computer processing terminal.
Further, the model NI-PCI5122 of the capture card.
The beneficial effects of the utility model are: the utility model, which is based on Michelson's interferometer principle, devises one kind fastly
The method and system of speed, accurately auto-focusing, focusing spatial resolution can reach micron order, use the reference of linear motion
Arm light path system is able to achieve quick and continuous linear array light path scanning, while it is minimum to be affected by the external environment, can be in various light and shades
Normal use under light environment, practicability are stronger.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described.Obviously, described attached drawing is a part of the embodiment of the utility model, rather than complete
Portion's embodiment, those skilled in the art without creative efforts, can also be obtained according to these attached drawings it
His design scheme and attached drawing.
Fig. 1 is the overall structure figure of the utility model；
Fig. 2 is utility model works flow chart.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to the design of the utility model, specific structure and generation
Clear, complete description, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
Art personnel other embodiments obtained without creative efforts belong to the model of the utility model protection
It encloses.In addition, all connection relationships being previously mentioned in text, not singly refer to that component directly connects, and referring to can be according to specific implementation feelings
Condition, by adding or reducing connection auxiliary, Lai Zucheng more preferably connection structure.Each technology in the utility model creation is special
Sign, can be with combination of interactions under the premise of not conflicting conflict.
Embodiment 1, referring to Fig.1, a kind of system of auto-focusing, including low-coherence light source 1, fiber coupler 2, reference arm
Light path system 3, sample arm light path system 7, computer processing terminal 12 and photodetector 13, the reference arm light path system 3 wrap
The first collimating mirror 4 and reflecting mirror 5 are included, first collimating mirror 4 is connected with reflecting mirror 5 by light, sample arm optical path system
System 7 includes camera 11, the second collimating mirror 8, half-reflecting half mirror 9 and flat field focus lamp 10, and second collimating mirror 8 is anti-by half
The reflecting surface of pellicle mirror 9 is connect with 10 light of f-theta mirror, and the half-reflecting half mirror 9 is quasi- with 45 ° of incident corner reflection second
The emergent light of straight mirror 8, and reflexed in f-theta mirror 10, the camera 11 is for receiving the half-reflecting half mirror 9
Transmitted light, the fiber coupler 2 respectively with low-coherence light source 1, the first collimating mirror 4, the second collimating mirror 8, photodetector 13
It is connected by optical fiber, the photodetector 13 is connected with computer processing terminal 12；
The light beam that low-coherence light source 1 issues enters fiber coupler 2, and light beam is divided into the first light according to the splitting ratio of 10:90
Beam and the second light beam, first light beam enter the first collimating mirror 4, and second light beam enters the second collimating mirror 8；
The photodetector 13 generates the interference signal peak in fiber coupler 2 for capturing, and is converted into electricity
Signal passes to computer processing terminal 12；
The computer processing terminal 12 is handled the electric signal according to Michelson's interferometer principle of interference, according to
Processing result adjusts the focal length of the camera 11.
As optimization, capture card is equipped between the photodetector 13 and computer processing terminal 12, the capture card is used
It is converted into digital signal in the electric signal for exporting photodetector 13, and gives the digital data transmission to computer processing terminal
12。
As optimization, the model NI-PCI5122 of the capture card.
The utility model is based on Michelson's interferometer principle:
If the electric field strength of two beam same frequency light waves is respectively as follows:
Y1=A1sin(ωt+Φ1)
Y2=A2sin(ωt+Φ2)
Wherein A1、A2For amplitude, Φ1、Φ2For phase.
The superimposed light intensity of two-beam are as follows:
Wherein I1、I2For the light intensity of two-beam,As interference term.When two-beam phase phase
Together, i.e. phase difference ΔΦ=Φ2-Φ1Interference strength is maximum when=0.
Since the utility model probe source is low-coherence light source 1, reference arm light path system 3, sample arm optical path system are come from
The two-beam of system 7 interferes in fiber coupler 2, then the light intensity after interfering are as follows:
Wherein, а0For DC terms, kiFor the corresponding wave vector of different wave length of light source, △ zjNot for sample arm light path system 7
The optical path difference for the light that the light and reference arm light path system 3 being reflected back with depth are reflected back, аijFor ki、△zjCorresponding light intensity width
Value.It can be seen that being only just to have the generation of interference signal peak at zero in optical path difference, then signal strength declines rapidly to positive and negative both sides
Subtract.
Utility model works process:
Sample 14 is placed on to the object space of f-theta mirror 10, low-coherence light source 1 issues laser and enters fiber coupler 2,
Light beam is divided into the first light beam and the second light beam according to the splitting ratio of 10:90, and the first light beam is after the first collimating mirror 4 collimates in parallel
Directive reflecting mirror 5, reflecting mirror 5 do quickly continuous linear motion, light beam along the direction of light beam incidence under the action of motor 6
When directive reflecting mirror 5, the light path of propagation linearly changes, and reflects, which is reflected back optical fiber with light path reference information
Coupler 2.It is enterprising to be reflected into f-theta mirror 10 by half-reflecting half mirror 9 after the second collimating mirror 8 collimates in parallel for second light beam
Line focusing, the light beam after focusing are reflected with 14 surface of sample, should be with the second light beam a part of 14 location information of sample
Along backtracking light coupling device, a part enters the CCD sensor devices of camera 11.
The light of light path and the second light beam with 14 location information of sample when the first light beam with light path reference information
When journey is equal, interference signal is generated, which is sent to photodetector 13, photodetector 13 by fiber coupler 2
It connects and converts interference light signal gain amplification to corresponding electric signal computer processing terminal 12, computer are transferred to by capture card
Processing terminal 12 is handled and is calculated to electric signal using software LabVIEW, and the position letter of sample 14 in space is obtained
Breath, obtains direction of the image planes position with respect to CCD sensor devices position and distance, adjusts camera 11 according to obtained azimuth-range
Lens focus, be overlapped image planes and the position of CCD sensor devices, complete auto-focusing movement, camera 11 to sample 14 into
Row shooting, if desired shoots next sample 14, then needs for sample 14 to be placed on the object space of f-theta mirror 10, repeats above-mentioned
Focus operation.If shooting is completed, computer processing terminal 12 saves data and closes system, terminates focus operation.
The utility model based on Michelson's interferometer principle devise a kind of fast and accurate auto-focusing method and
System, focusing spatial resolution can reach micron order, using the reference arm light path system 3 of linear motion, be able to achieve quickly and
Continuous linear array light path scanning, while it is minimum to be affected by the external environment, can under various light and shade light environments normal use, it is practical
Property is stronger.
With reference to Fig. 2, a kind of system of auto-focusing includes a kind of method of auto-focusing, and the method includes following
Step:
Autofocus system is initialized, sample 14 is placed on to the object space of f-theta mirror 10；
The light beam that low-coherence light source 1 issues is divided into the first light beam and the second light by the splitting ratio of 10:90 through fiber coupler 2
Beam；
After the first collimating mirror 4 collimates in parallel, directive reflecting mirror 5,5 linear movement of reflecting mirror makes first light beam
The propagation light path of first light beam linearly changes, and first light beam is returned with light path referring to information original road after the reflection of reflecting mirror 5
Back into optical fibers coupler 2；
Second light beam is after the second collimating mirror 8 collimates in parallel, directive half-reflecting half mirror 9, the half-reflecting half mirror 9
Second light beam is reflected on f-theta mirror 10 and is focused, the second light beam after focusing contacts with sample 14 and in sample 14
Surface is reflected, and for a part of reflected light along backtracking fiber coupler 2, another part of reflected light enters camera 11
CCD sensor devices；
The first light beam and the second light beam for returning to fiber coupler 2 interfere, and generate interference signal peak；
The photodetector 13 captures interference signal peak, and is converted into electric signal and passes to computer processing terminal
12；
The computer processing terminal 12 is handled the electric signal according to Michelson's interferometer principle of interference, is obtained
Sample 14 is at a distance from f-theta mirror 10；
The focal length of 11 camera lens of camera is adjusted at a distance from f-theta mirror 10 according to the sample 14 so that image planes with it is described
The position of CCD sensor devices is overlapped.
The method that the propagation light path of first light beam linearly changes includes: linear change reflecting mirror 5 and the first collimating mirror
The distance between 4.
Reflecting mirror 5 does LINEAR CONTINUOUS linear motion along the direction of the first light beam incidence, in the movement of the first light beam directive
The light path of reflecting mirror 5, propagation linearly changes.The linear line movement of reflecting mirror 5 is more steady, is conducive to ensure light path scanning
Stability.
The utility model method can when shooting sample 14 auto-focusing, and the exploring laser light in focus process will not be to bat
It takes the photograph quality to impact, by extracting 14 location information of sample using interference signal, realizes rapid focus, spatial resolution reaches
To micron order.
The better embodiment of the utility model is illustrated above, but the utility model creation is not limited to
The embodiment, those skilled in the art can also make various etc. without departing from the spirit of the present invention
Same variation or replacement, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (3)
1. a kind of system of auto-focusing, it is characterised in that: including low-coherence light source, fiber coupler, reference arm light path system,
Sample arm light path system, computer processing terminal and photodetector, the reference arm light path system is including the first collimating mirror and instead
Mirror is penetrated, first collimating mirror is connected with reflecting mirror by light, and the sample arm light path system includes camera, the second collimation
Mirror, half-reflecting half mirror and flat field focus lamp, the reflecting surface and f-theta mirror light that second collimating mirror passes through half-reflecting half mirror
Line connection, the half-reflecting half mirror are reflexed to f-theta with the emergent light of 45 ° of the second collimating mirror of incident corner reflection
In mirror, the camera is used to receive the transmitted light of the half-reflecting half mirror, the fiber coupler respectively with low-coherence light source, the
One collimating mirror, the second collimating mirror, photodetector are connected by optical fiber, and the photodetector is connected with computer processing terminal
It connects；
The light beam that low-coherence light source issues enters fiber coupler, and light beam is divided into the first light beam and the according to the splitting ratio of 10:90
Two light beams, first light beam enter the first collimating mirror, and second light beam enters the second collimating mirror；
The photodetector generates the interference signal peak in fiber coupler for capturing, and is converted into electric signal transmitting
Give computer processing terminal；
The computer processing terminal is handled the electric signal according to Michelson's interferometer principle of interference, is tied according to processing
Fruit adjusts the focal length of the camera.
2. a kind of system of auto-focusing according to claim 1, it is characterised in that: at the photodetector and computer
It manages and is equipped with capture card between terminal, the capture card is used to convert digital signal for the electric signal that photodetector exports, and
Give the digital data transmission to computer processing terminal.
3. a kind of system of auto-focusing according to claim 2, it is characterised in that: the model NI- of the capture card
PCI5122。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821818005.5U CN209055782U (en) | 2018-11-05 | 2018-11-05 | A kind of system of auto-focusing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821818005.5U CN209055782U (en) | 2018-11-05 | 2018-11-05 | A kind of system of auto-focusing |
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| Publication Number | Publication Date |
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| CN209055782U true CN209055782U (en) | 2019-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821818005.5U Expired - Fee Related CN209055782U (en) | 2018-11-05 | 2018-11-05 | A kind of system of auto-focusing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358462A (en) * | 2018-11-05 | 2019-02-19 | 佛山科学技术学院 | A kind of method and system of auto-focusing |
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2018
- 2018-11-05 CN CN201821818005.5U patent/CN209055782U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358462A (en) * | 2018-11-05 | 2019-02-19 | 佛山科学技术学院 | A kind of method and system of auto-focusing |
| CN109358462B (en) * | 2018-11-05 | 2024-01-19 | 佛山科学技术学院 | Automatic focusing method and system |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190702 Termination date: 20201105 |